Why is love the highest vibration?

Love is the highest vibration of a strong life force. 

In its higher vibration, it is construction, and in its lowest vibration, it is destruction. Just as cold is the absence of heat, so is hate the absence of love. 

Many of these qualities, which we think are so dreadful are only the lower vibration, of a force that in its higher vibration is beautiful.

—Ione in Spirit